As far as I know, the accepted age of the universe is Planck's measurement of approximately 13.82 billion years. Using this number, and the number of seconds in a non-leap year which we can calculate:
1 minute = 60 seconds
1 hour = 60 minutes = 3,600 seconds
1 day = 24 hours = 86,400 seconds
1 year = 365 days = 31,536,000
Now we can multiply this number by the age of the universe in years:
31,536,000 * 13,820,000,000 = 4.36x10^17 seconds
Therefore 4.36x10^17 seconds is a rough approximation of the age of the universe in seconds.
